It is well known that high or deep cells tend to touch the
\hlines of a tabular. This package provides a
modifier S acting on usual column types so that to ensure
a minimal distance that can be controlled through two parameters
\cellspacetoplimit and \cellspacebottomlimit.

The approach employed by this package is noticeably simpler than
that of tabls, which considers the
dimensions of each entire row; whereas you can ask the cellspace
only to look at the cells of potentially difficult columns.